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Power-Programmierung
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emm28_h.asm
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Assembly Source File
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1989-11-29
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3KB
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71 lines
;-----------------------------------------------------------------------------;
; MODULE NAME: EMM28_H.ASM ;
; ;
; OS FUNCTION NAME: disable_DMA_reg_set ;
; ;
; DESCRIPTION: This function disables DMA accesses for all DMA ;
; channels which were associated with a specific ;
; alternate DMA register set. ;
; ;
; PASSED: DMA_reg_set: ;
; is the number of the DMA register set for which all ;
; operations are to be disabled. If the DMA set ;
; specified is zero, no action will be taken. ;
; ;
; RETURNED: status: ;
; is the status EMM returns from the call. All other ;
; returned results are valid only if the status ;
; returned is zero. Otherwise they are undefined. ;
; ;
; C USE CONVENTION: unsigned int status; ;
; unsigned int DMA_reg_set; ;
; ;
; status = disable_DMA_reg_set (DMA_reg_set); ;
;-----------------------------------------------------------------------------;
.XLIST
PAGE 60,132
IFDEF SMALL
.MODEL SMALL, C
ENDIF
IFDEF MEDIUM
.MODEL MEDIUM, C
ENDIF
IFDEF LARGE
.MODEL LARGE, C
ENDIF
IFDEF COMPACT
.MODEL COMPACT, C
ENDIF
IFDEF HUGE
.MODEL HUGE, C
ENDIF
INCLUDE emmlib.equ
INCLUDE emmlib.str
INCLUDE emmlib.mac
.LIST
.CODE
disable_DMA_reg_set PROC \
DMA_reg_set:WORD
;---------------------------------------------------------------------;
; do; ;
; . disable DMA into expanded memory using the DMA register set ;
; . specified by the OS; ;
;---------------------------------------------------------------------;
MOVE AX, disable_dma_on_alt_map_regs_fcn
MOVE BX, DMA_reg_set
INT EMM_int
;---------------------------------------------------------------------;
; . return (EMM status); ;
; end; ;
;---------------------------------------------------------------------;
RET_EMM_STAT AH
disable_DMA_reg_set ENDP
END